#! /bin/sh

firebot () {
    read cmd args
    case $cmd in
        calc)
            printf "%s = " "$args"
            echo "$args" | bc -l
            ;;
        units)
            src=$(echo "$args" | sed 's/ ->.*//')
            dst=$(echo "$args" | sed 's/.*-> //')
            units -1 -v -- "$src" "$dst"
            ;;
        .note)
            who=$(echo $args | cut -d\  -f1 | tr -d -c A-Za-z0-9)
            what=$(echo $args | cut -d\  -f2-)
            when=$(date)
            echo "($when) <$sender> $what" > notes/$who
            echo "I've left $who a note, $sender."
            ;;
        *)
            exit 1
            ;;
    esac
}

if [ -f notes/$sender ]; then
    echo "Welcome back, $sender.  Your messages:"
    cat notes/$sender
    rm notes/$sender
fi

echo "$1" | firebot